With the rapid development in the field of microelectronics and microelectronics processing technology, manufacturing microelectronic devices using inkjet printing technology has become a popular direction in additive manufacturing. In this paper, an UV-curable vinyl-terminated polyarylether prepolymer was prepared by nucleophilic substitution reaction with twisted non-coplanar phthalazinone and hexafluoroisopropyl as structural units. A new low dielectric ink system for 3D printing was constructed by using diacrylate reactive diluents and free radical fast initiators into the prepolymer. The results show that the viscosity of the ink system before curing is lower than 300 mPa·s,indicating good processability. After UV and thermal curing, the infrared testing shows that the curing degree can reach over 87%, and the curing is basically complete. The minimum volume shrinkage is only 2.4%, which indicate the ink has excellent dimensional stability. The glass transition temperature of the material can reach up to 210℃, and the thermal decomposition temperature can reach up to 370℃, which indicate the ink has the potential of long-term use at 150℃. At 10 GHz, the dielectric constant of the material can reach 2.61, and the dielectric loss factor is only 0.014, which indicate the ink has excellent dielectric properties. The ink system prepared in this study is applicable to the additive manufacturing process of large curvature conformal circuit and has good application prospect in the field of microelectronics.

UV curing  /  3D printing  /  low dielectric constant  /  phthalazinone  /  polyarylether